The process of rendering animation in Cycles Render
You could render it out to an AVI video file and import it into Magix that way. 

In my opinion it's better to render out to an image sequence and then import that into Magix. The reason being is you eliminate one phase of video compression that way and Magix has better source material to encode to your final video file.

If you render out your animation to a series of PNG files (you can set the amount of file compression in the Output settings), Magix should be capable of importing the image sequence into its timeline.